怎样简便就怎样算(乘法分配律,脱式)我还做作业呢,68×5+123×5= 32+32×99= (40+2)×25= 101×24= 286×47+286×52+286=

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怎样简便就怎样算(乘法分配律,脱式)我还做作业呢,68×5+123×5=32+32×99=(40+2)×25=101×24=286×47+286×52+286=怎样简便就怎样算(乘法分配律,脱式)我还

怎样简便就怎样算(乘法分配律,脱式)我还做作业呢,68×5+123×5= 32+32×99= (40+2)×25= 101×24= 286×47+286×52+286=
怎样简便就怎样算(乘法分配律,脱式)我还做作业呢,
68×5+123×5= 32+32×99= (40+2)×25= 101×24= 286×47+286×52+286=

怎样简便就怎样算(乘法分配律,脱式)我还做作业呢,68×5+123×5= 32+32×99= (40+2)×25= 101×24= 286×47+286×52+286=
68×5+123×5
=(68+123) ×5
=191×5
=(200-9)×5
=200×5-9×5
=1000-45
=9955
32+32×99
=32×(1+99)
=32×100
=3200
(40+2)×25
=40×25+2×25
=1000+50
=1050
101×24
=(100+1)×24
=100×24+1×24
=2400+24
=2424
286×47+286×52+286
=286×(47+52+1)
=286×100
=28600